Pump and motor



14, 1929. M. A. SEAHOLM 2 Sheets-Sheet l PUMP AND MOTOR Filed Dec. 27, 1927 INVENTOR w (L 04 Wm & WMGmkZSQLw WkCa- L May 14, 1929. M. A. SEAHQLM PUMP AND MOTOR 2 Sheets-Sheet 2 Filed Dec. 2'7, 192'? M12 ATF'QRNEVE llli Zil

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lllTlTEl) STATEfi rmnr aim Moron.

hppltcation filed fieccmber a7, 1927. Serial No. Mahdi.

ll/iy invention relates to an engine of the rotary piston typcwhich may be used either as a pumping engine or a motor, and is reversible in direction oi rotation. The present application relates more particularly to an invention embodied in a construction illustrated and described as a moditied iorm oi the invention oi my pending application ior patent filed December 9, 1926, Serial No. l53,52i, and the present application which may be regarded as in part a continuation oi said iormer application, is intended to specifically cover a pumping engine or motor in which a pair oi sleeves, severally connected to vane members. are arranged to cooperate with a single diametrically-slotted rotor member. The rincipal advantage which it is the object oi my invention to attain is a reduction in the vibration oi the engine which is due to acceleration and retardation oi the sleeve member employed in pumps having but one such member.

in the drawings accompanying this specification ll have illustrated my invention both in the best iorm lmown to me and a modified iorm. lBigurc It oi the drawings shows in elevation the parts oi the engine as'seen beyond a lane indicated bythc dotted line Ill-It oi "'ig. 2, with the cap plate shown at the leit oi said Fig. 2 removed, and viewing the parts irom leit to right, as indicated by the arrow;

big. 2 is a central vertical section oi'the engine, the rotor being shown partly in elevation and partly brolren away to better show its construction and the arrangement oi the vane members;

Fig. 3 is a iace view oi the right end cap plate as indicated by the dotted line 3-3 of i fi" i i is a iaoe view oi the vane members, detac ed;

l ig. ti is a view oi a modified iorm of my invention corresponding to ll ig. l; and

Fig. d is a central vertical section of said modified iorm, corresponding in general to.

iiihe reierence letters indicate like parts in all the figures oi the drawings.

Describing first the reierred iorm oi my invention, the casing o the engine includes a central annular body member l, iormed with a base l by means oi which it is supported, and havin parallel ground end iaces to provide a rig t joint with the corres ondingly finished iaces oi a leit end cap p ate 2 and right end cap plate 3. The body member l is formed with a pair oi oppositely arranged ilow passages 4t-i extending horizontally near each other from end to end, one on each side oi the center of the machine and near its top. The passages i and 4 communicate respectively with openings in bosses which provide inlet and outlet (low connections with such passages.

The cap plates 2 and 3 are each formed with recesses in communication with the flow passages i and loi the body member, the form and arrangement oi the recesses being illustrated in Fig. 3. Each recess consists oi a top portion 6 and an arcuate lower and inner portion 6 which is concentric with the axis of a rotor member later to be described and provides a port opening into the working chamber oi the engine. The ends oi the ports 6 in each cap plate lic diametrically opposite the axis oi the rotor.

Rotatably seated within the bearing iormed by the inner iace oi the annular body member are two sleeves i and h which make sliding contact with each other and with the inner iaces oi the cap plates 2 and 3, re spectively. For lightness oi construction tiese sleeves may be iormed with central peripheral channels, as illustrated.

Within the sleeves 7 and 8 is arranged the rotor member beiore reierred to, marked 9, which is arranged eccentrically oi such sleeves and in sliding contact therewith along a line midway between the passages and ports 6 and h on o posite sides oi the center oi the-engine. he rotor is secured in the present instance by a cross-pin it), to a shaft ltl which is jonrnaled in the end plates oi the engine and may be provided with glands to iorm a sealed hearing as shown.

The rotor member is iormed with two diametrically opposite radial slots, within which are arranged two pairs oi vane members, one pair associated with the sleeve member 7 and the other pair with the sleeve member 8. One vane, marlred l1, oi the air oi vanes associated with the sleeve 7 is noted to such sleeve through a pivot portion ll which permits a limited swinging movement of the vane, while the other vane, marked 12, is not so connected and is iree to slidingly follow the inner iace oi the sleeve. The other pair oi vanes are similarly arranged, excepting that the pivotal end it of the vane 13 is pivoted to the sleeve 8 at a point diametritill ltltl lid cally opposite the pivot 11 and the vane 14 is on the opposite side of the rotor from the vane 12 The inner sides of the two sets of vane members slicingly contacteach and the shaft 10.

The modified form of my invention illustrated in Figs. 5 and 6 is the same as that described in my said pending application, and differs from that already described in that the rotor is formed in two parts, marked 14 and 15, rigidly secured together by bolts and formed respectively with diskshaped extensions 16 and 17 integral with journal portions 18 and 19, respectively, said extensions and journal portion being rotatably mounted in seats formed in the cover plates 2* and 3. The rotor sections are formed with diametrical slots which when the'sections are secured together form a single continuous slot extending. through the rotor. The vane members are longer in diametrical dimensions than the vanes of the preferred form of my invention illustrated in Figs. 1 to 4, and if desired springs 20 ma be interposed between the members of eac pair, as illustrated, to maintain contact of the free vane-with the inner wall of its associated sleeve.' In practice, however, the centrifugal. force of such member has been found to eif'ect this result and the springs may therefore be omitted.

Like the engine described in my aforesaid pending application, my present engine is entirely symmetrical in construction and reversible with respect to its flow connections and direction of rotation, and may be operated either as a pump or blower, or as a motor. Assuming it to be operated as a blower (or compressor), and the shaft 18 to be ositively driven in the direction indicate by the arrow upon Figs. land 5, at a constant speed, the flow passage 4 will be the intake and the passage 4 the outlet for air or other fluid acted upon. The space between the rotor and two sleeves 7 and 8 and the inner faces of the cap plates 2 and 3 intermediate the ends of the arcuate ports in such ca 5 and below the horizontal diameter of t e rotor constitutes a working chamber which the vanes on the side of the rotor leave as the vanes on the other side enter, so that the laterally adjacent vanes working in the slot on one or the other side of the rotor will at all times be drawing in the air into the cylinder on their rear sides through the ports 6 in the cap late 2 and flow passages leading from the goes 5, and forcing the air in front of them in such cylinder out through the opposite ports and passages hailing through the boss 5*. The laterally ad acent vanes 11 and 14 consequently function as one piston, and the vanes 12 and 13 as another, the pistons alternately traversing the working chamber in one direction.

It is obvious that while the rotor and sleeves 7 and 8 will always remain in contact at their line of contact at the top, the pivoted base 11 of the vane 11 traveling in the circumference of the sleeve 7, will traverse a longer path than the end of the rotor slot in which such vane slides, which travels in the circumferential path of the face of the rotor, and that said sleeve, in making one complete revolution from the position shown in Fig. 1, will be accelerated uniformly throughout the first half of its revolution, and retarded uniformly throughout the remaining half. The sleeve 8 will in the same manner be accelerated during the period while the pivot 13 of the vane 13 travels from a position at the highest point of its path to the lowermost position, be retarded during the remainder of its revolution, and since the pivotal connection 11" and 13 are 180 apart, it follows that one vane will be accelerating while the other 'vane is retarding. The inertia of one sleeve and connected vane will therefore balance the momentum of the other sleeve and vane, and all vibration from this source be elim inated. At the high speeds at which the engine is operated this is an important advantage, and greatly increases the smoothness of its running.

As before explained the centrifugal force of the unconnected vanes in either of the forms of my invention above described is sufficient to cause the outer edge of the vane to hug the inner surface of the sleeve (which travels in the same direction, but owing to the variation in speed of the sleeve oscillates slightly with respect tothe vane), and the slight compression of air between each pair of vanes in the inner end of the slots and intercommunicating cross passages of orifices 10 as they approach each other assists in causing the unconnected vanes to shift radially outward as the movement of the rotor permits them to do so.

Inasmuch, however, as the vanes 11 and 14 shift their positions in the rotor slot simultaneously and function as a single piston, as above explained, and the vanes 12 and 13 have like movements and function, each pair of laterally adjacent vanes may be made integral, although the difiiculty of attaining accurately fitted joints with the sleeves constitutes an objection to this construction. If desired, furthermore, the vanes 11 and 14, separately formed, may be connected through a stud 30 and socket (see Fig. 4), the connection being preferably sufficiently loose-fitting to permit the vane did ill

miaeao 14 to seat against the inner face of the ring passages leading through the boss 5.

I claim:

l. In h fluid pressure engine, a stationary closed casin having within a peripheral cylindrical ace and parallel end faces, a pair of similar sleeves rotatalol mounted in said casing and together extending from one end face to the other, arotor slotted on diametrical lines rotatabl mounted in said casing and having a cylindrical face of lesser diameter than the inner faces of the sleeves, said rotor being arranged eccentrically of said sleeves and contacting their inner faces, two diametrically opposite vane pistons slidingly mounted in said slotted rotor, one piston hein pivoted on one side of the rotor to one s eeve and the other iston being pivoted on the other side of t e rotor to the other sleeve, and said casing being formed with fiow passages terminating in ports opening severally into the space between said rotorand pair of sleeves on o posite sides of their line of contact, and sold pistons hein arranged to alternate! traverse a wor ing chamber defined y the sleeves and rotor and rtions of the end faces of the casing wa l intermediate said ports.

2. In a fluid pressure engine, a stationary closed casin having within a peripheral cylindrical ace and parallel. end faces, a pair of similar sleeves rotatably mounted in said casing and to other extending from one end face to the ot er, a rotor slotted on diametrical lines rotatably mounted in said casing and having a cylindrical face of lesser, diameter than the inner faces of the .sleeves, said rotor heing arranged-eccem trically of said sleeves and contacting their inner faces, a pairvof vanes slidingly arranged in said slotted rotor'and severally pivoted to said sleeves, the point of pivotal attachment of one vane being on the opposite side of the rotor from that of the other vane, a second pair oi sliding vanes severally arranged diametrically opposite said pivoted vanes and each free to slidingly contact the sleeve to which its diametrically opposite vane is pivoted, said casing being termed with flow passages terminating in ports opening severally into the space between said till rotor and pair of sleeves on opposite sides of their line of contact, and. each pivoted vane together with the vane laterally adjacent to it constituting one oi a pair of pistons which alternately traverse a working chamber defined by the sleeves and rotor and portions of the end faces of the casing wall intermediate said ports.

3. A. fluid pressure engine according to claim 1 inwhich said rotor is an integral body formed with two diametrically opposite radial slots in which said vane pistons are mounted.

4t. A fluid pressure engine according toclaim 2 in which said rotor is formed with radial slots in communication with each other,

5, A fluid pressure engine according to claim 2 in which each pivoted vane is loosely connected to the laterally adjacent vane.

In testimony whereoil, l have snhserihed my name,

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